I would contend that it is quite good, but an actual tank trinket is better. However if your raid groups dps is a bit low, it's certainly worth looking into as the dps requirements in MV are quite tight. Once again, tank dps actually matters.

It was telling my friends shadowpriest to enchant expertise the other day.

As always when using a tool such as this, use some judgement, don't just take what it says and move on.

Also, reporting the bug on their forums would help the tool improve.

Expertise equals spell hit now. Spriests can use a combination of Hit, Spirit, and Expertise to reach the 15% spell hit cap. This change went live in 5.0.4. I'd say askmrrobot is telling your spriest friend to do exactly what he needs to do. As for tank trinkets, make sure your stat weights are correct. Their default stat weights are a little all over the place and I've had friends have problems trying to save them on Internet Explorer.

Hey, I'm one of the people behind Ask Mr. Robot. We simulate every trinket for every class to find out if it's best for YOU. Here's a list for frost DKs - if you want a different spec, just swap it in the drop down menu. http://www.askmrrobot.com/wow/trinke...knightunholy2h

Anyway, all of these suggestions are based on the proc rates and internal cooldowns that we found across the internet. If a trinket does seem a bit off, let us know. It could be that there is new information on proc rates that we need to update.

Hey, I'm one of the people behind Ask Mr. Robot. We simulate every trinket for every class to find out if it's best for YOU. Here's a list for frost DKs - if you want a different spec, just swap it in the drop down menu. http://www.askmrrobot.com/wow/trinke...knightunholy2h

Anyway, all of these suggestions are based on the proc rates and internal cooldowns that we found across the internet. If a trinket does seem a bit off, let us know. It could be that there is new information on proc rates that we need to update.

I'm not sure why you would be using a sim model for tanking though. Even at the end of Cata, there wasn't really any easy way to math out the DK tanks besides "Stack Mastery, lololol". But looking at the forums, there wasn't a lot of simple math behind it.

The zone drop in MSV is awesome, static STA and on use Mastery, follow that up with the other DMF trinket, or something else with static Stamina.

The reason we sim the trinkets is to find total uptime for the procs. For example, with Stuff of Nightmares, we want to know the average uptime for the dodge proc. So we take the proc chance, duration (in this case 20 seconds), and find out how much you really get from it. In this case, we found you get 1241 dodge on average from the proc from Stuff of Nightmares. So then when you load your character and input stat weights, we apply your stat weight for dodge to the dodge you get from this trinket

The other reason simming it for each class and spec is important is that each spec gets a different use out of it. The biggest case this matters for is on-hit chances. Each class can hit at different rates, so the chance to proc it will be slightly different. For example, Blood DK's get 1241 dodge out of Stuff of Nightmares, but protection warriors get 1250 dodge from it.

Moving on to Relic of Xuen: I don't see that in the BiS list here. What settings are you using? Mr. Robot will give you a BiS set that is customized to your stat weights and other options (like the level of gear you want, racial bonuses, etc).